AD 91-06-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Glasflugel | H 301 Libelle | Airworthiness Directives; GLASFLUGEL Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders |
| aircraft | Glasflugel | H 301B Libelle | Airworthiness Directives; GLASFLUGEL Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders |
| aircraft | Glasflugel | Kestrel | Airworthiness Directives; GLASFLUGEL Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders |
| aircraft | Glasflugel | Standard Libelle | Airworthiness Directives; GLASFLUGEL Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders |
| aircraft | Glasflugel | Standard Libelle-201B | Airworthiness Directives; GLASFLUGEL Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders |
Unsafe Condition
Failures in the rudder control system due to use of DIN specification 055, 6 by 7 inch rudder cables with a diameter of 2.55 mm (.098 in.) having a hemp core.
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Required Actions
Replace rudder cables with 7 by 7, 3/32 inch cables per MIL-W-83420D or MIL-W-1511A, and connections per Actions 2 of specified Technical Notes. Inspect cables every 100 hours TIS for wear, fraying, corrosion, twisting, or damage; replace damaged cables before further flight.
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Compliance Time
Within the next 25 hours time-in-service (TIS) after the effective date, and subsequent inspections within 100 hours TIS after cable replacement or effective date, then every 100 hours TIS.
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Affected Aircraft
Glasflugel Models H301 Libelle, H301B Libelle, Standard Libelle, Standard Libelle 201, Standard Libelle 201B, Standard Libelle 203, Kestrel 604, and BS-1 Gliders (all serial numbers)
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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